Seismic interpretation of the Cretaceous unconformities and sequences in the Middle Magdalena Valley and the western margin of the Eastern Cordillera, Colombia

IF 2 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Comptes Rendus Geoscience Pub Date : 2021-05-27 DOI:10.5802/CRGEOS.47

Jairo Guerrero, Luis Montes, E. Jaillard, A. Kammer

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引用次数: 2

Abstract

Geoscientists commonly focus on Tertiary units to understand the Andean uplift and deformation of the eastern Cordillera of Colombia, whereas the Cretaceous evolution remains poorly known. Cretaceous units are exposed in western Eastern Cordillera, but outcrops are scarce in the Middle Magdalena Valley. Recent seismic acquisition programs and new wells drilled through the Cretaceous succession led to a better understanding of unconformities and sequences in both the Middle Magdalena Valley and the western flank of the Eastern Cordillera. This paper identifies unconformities bounding seismic sequences and deciphers Cretaceous structural deformation in the Middle Magdalena Valley and western Eastern Cordillera based on the interpretation of sizable seismic reflection sections and well information. The analysis of sedimentary sequences and unconformity surfaces allowed identification of stages of pre-Eocene deformation. Regional correlations of sequences and unconformities recognized here with those identified by other authors support the occurrence of Cretaceous regional tectonic events.

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哥伦比亚马格达莱纳河谷中部和科迪勒拉东部西部边缘白垩纪不整合面和层序的地震解释

地球科学家通常关注第三纪单元，以了解哥伦比亚科迪勒拉东部的安第斯隆起和变形，而白垩纪的演化仍然鲜为人知。白垩纪单元暴露在科迪勒拉东部西部，但马格达莱纳河谷中部的露出地表很少。最近的地震采集计划和在白垩纪序列中钻探的新井使人们更好地了解了马格达莱纳河谷中部和科迪勒拉东部西侧的不整合面和层序。本文通过对大面积地震反射剖面和井资料的解释，识别了地震序列边界的不整合面，并破译了马格达莱纳河谷中部和科迪勒拉东部西部白垩纪构造变形。通过对沉积序列和不整合面的分析，可以确定始新世前的变形阶段。本文所识别的层序和不整合面与其他作者所识别的区域相关性支持白垩纪区域构造事件的发生。

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来源期刊

Comptes Rendus Geoscience 地学-地球科学综合

CiteScore

2.80

自引率

14.30%

发文量

审稿时长

5.9 weeks

期刊介绍： Created in 1835 by physicist François Arago, then Permanent Secretary, the journal Comptes Rendus de l''Académie des sciences allows researchers to quickly make their work known to the international scientific community. It is divided into seven titles covering the range of scientific research fields: Mathematics, Mechanics, Chemistry, Biology, Geoscience, Physics and Palevol. Each series is led by an editor-in-chief assisted by an editorial committee. Submitted articles are reviewed by two scientists with recognized competence in the field concerned. They can be notes, announcing significant new results, as well as review articles, allowing for a fine-tuning, or even proceedings of symposia and other thematic issues, under the direction of invited editors, French or foreign.